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12 questions
Slate
Basalt
Marble
Obsidian
Marble
Conglomerate
Shale
Slate
Marble
Limestone
Gneiss
Pumice
Obsidian
Limestone
Granite
Conglomerate
Shale
Pumice
Sandstone
Gneiss
Sandstone
Shale
Slate
Basalt
Obsidian
Granite
Slate
Obsidian
Schist
Gneiss
Pumice
Schist
Marble
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